add unit test for QueryServer

[sullis]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 61.78%. Comparing base (59551e4) to head (e461c09).
Report is 92 commits behind head on master.

Files	Patch %	Lines
...a/org/apache/pinot/core/transport/QueryServer.java	42.85%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12599      +/-   ##
============================================
+ Coverage     61.75%   61.78%   +0.03%     
- Complexity      207      211       +4     
============================================
  Files          2436     2451      +15     
  Lines        133233   133846     +613     
  Branches      20636    20750     +114     
============================================
+ Hits          82274    82695     +421     
- Misses        44911    45046     +135     
- Partials       6048     6105      +57     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	61.71% <42.85%> (+<0.01%)	⬆️
java-21	61.66% <42.85%> (+0.04%)	⬆️
skip-bytebuffers-false	61.77% <42.85%> (+0.02%)	⬆️
skip-bytebuffers-true	61.61% <42.85%> (+33.88%)	⬆️
temurin	61.78% <42.85%> (+0.03%)	⬆️
unittests	61.77% <42.85%> (+0.03%)	⬆️
unittests1	46.93% <42.85%> (+0.03%)	⬆️
unittests2	27.70% <0.00%> (-0.03%)	⬇️

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[sullis]

ready for review